Air Conditioner AC Compressor Clutch Kit Compatible with Silverado 2500 3500 HD 2015-2021 6.6L & Sierra 2500 HD 2015-2021 6.6L, Sierra 3500 HD 2015-2019 2021 6.6L. Premium-Grade Materials: Manufactured with high-tensile carbon steel and heat-treated components to resist warping, slippage, and premature wear under high-load conditions.